MCQs of Electromagnetic Waves

Electromagnetic Waves MCQs

MCQs of Electromagnetic Waves

Showing 61 to 70 out of 112 Questions

61.

The dimensions E/B are the same as that of _____ .

(a)	momentum
(b)	acceleration
(c)	velocity
(d)	current

62.

Electromagnetic waves are emitted by an oscillating charge with _____ .

(a)	zero acceleration
(b)	non - zero acceleration
(c)	constant velocity
(d)	none of the above

63.

Electromagnetic waves do not transport _____ .

(a)	energy
(b)	charge
(c)	momentum
(d)	information

64.

In an electromagnetic wave, the electric and magnetic fields are 200 V m^-1 and 0.30 A m^-1. The maximum energy flow is _____ .

(a)	60 W m^-2
(b)	30 W m^-2
(c)	120 W m^-2
(d)	160 W m^-2

65.

The pressure exerted by an electromagnetic wave of intensity I on a non - reflecting surface is _____ . (where c = velocity of light)

(a)	Ic
(b)	Ic²
(c)	$\frac{I}{c}$
(d)	$\frac{I}{c^{2}}$

66.

In an electromagnetic wave the average energy density associated with the magnetic field will be _____ .

(a)	$\frac{1}{2} L I^{2}$
(b)	$\frac{B^{2}}{2 μ_{0}}$
(c)	$\frac{1}{2} μ_{0} B^{2}$
(d)	$\frac{1}{2} \frac{μ_{0}}{B^{2}}$

67.

An electromagnetic wave travels in xy plane making an angle θ with X - axis, then the equation of the wave is _____ .

(a)	E = E₀ sin (ωt - kx cos θ - ky sin θ)
(b)	E = E₀ sin (ωt - kx sin θ - ky cos θ)
(c)	E = E₀ sin (ωt - kx cos θ + ky sin θ)
(d)	E = E₀ sin (ωt - kx sin θ + ky cos θ)

68.

Red light differs from yellow light in its _____ .

(a)	frequency
(b)	intensity
(c)	velocity
(d)	All of the above

69.

At a particular instant, the electric field intensity in an electromagnetic wave in vacuum is 2 × 10^-3 NC^-1. The magnitude of the magnetic induction of the wave will be _____ .

(a)	6.7 × 10^-12 T
(b)	6.7 × 10^-10 T
(c)	6.7 × 10^-9 T
(d)	6.7 × 10^-14 T

70.

A radio wave of intensity 3 Wm^-2 is absorbed by a surface. The pressure exerted on the surface is _____ .

(a)	10^-6 Nm^-2
(b)	10^-8 Nm^-2
(c)	10^-10 Nm^-2
(d)	10^-4 Nm^-2

Showing 61 to 70 out of 112 Questions